CN114428080A - Large-breadth object flexible visual online detection system - Google Patents
Large-breadth object flexible visual online detection system Download PDFInfo
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- CN114428080A CN114428080A CN202210085197.8A CN202210085197A CN114428080A CN 114428080 A CN114428080 A CN 114428080A CN 202210085197 A CN202210085197 A CN 202210085197A CN 114428080 A CN114428080 A CN 114428080A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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Abstract
The invention relates to the field of visual detection, in particular to a large-breadth object flexible visual online detection system, which is characterized in that: the system comprises an installation support, a linear array camera, a linear array light source, a position sensor, an encoder and a control cabinet; the mounting bracket is arranged at the side part of the production line and is used for mounting the linear array light source and the linear array camera; the linear array camera is arranged on the mounting bracket and is positioned above the production line; the linear array light source is long-strip-shaped, is arranged on the mounting bracket and transversely extends relative to the conveying direction of the production line, and is used for irradiating a measured object on the production line; the position sensor is arranged on the production line and used for collecting the start-stop position information of the measured object; the encoder is arranged on the production line, the detection end of the encoder is in contact with the conveying belt of the production line, and the encoder is used for acquiring the movement distance of the measured object in real time; and the control case is in signal connection with the linear array camera, the linear array light source, the position sensor and the encoder. The invention has large detection image amplitude and high detection precision.
Description
Technical Field
The invention relates to the field of visual detection, in particular to a large-breadth object flexible visual online detection system.
Background
Along with the continuous innovation development of the national artificial intelligence information technology, the demand of an automatic system is continuously increased, visual detection is continuously infiltrated into the visual detection system in each industry, the visual detection system mainly aims at replacing manual work to detect product defects, particularly in the industrial manufacturing industry, the speed of manual visual detection is low, the number of missed detections is large, the detection rate is low, the visual detection system can better meet the detection demand, the defective rate of enterprises can be reduced, the cost is reduced, and the production efficiency is improved.
Most of the existing visual detection equipment in the current market has small detection picture, the precision is low when a large-format product is detected, the production requirement cannot be met, and the visual detection technology is not favorable for rapid industrial application and popularization.
Disclosure of Invention
The invention aims to provide a large-format object flexible visual online detection system which is large in detection image width and high in detection precision.
In order to solve the technical problems, the technical scheme of the invention is as follows: a large format object flexible visual online detection system, comprising: the system comprises an installation support, a linear array camera, a linear array light source, a position sensor, an encoder and a control cabinet;
the mounting bracket is arranged at the side part of the production line and is used for mounting the linear array light source and the linear array camera;
the linear array camera is arranged on the mounting bracket and positioned above the production line and used for shooting a measured object on the production line;
the linear array light source is long-strip-shaped, is arranged on the mounting bracket and transversely extends relative to the conveying direction of the production line, and is used for irradiating a measured object on the production line;
the position sensor is arranged on the production line and used for collecting the start-stop position information of the measured object;
the encoder is arranged on the production line, the detection end of the encoder is in contact with the conveying belt of the production line, and the encoder is used for acquiring the movement distance of the measured object in real time;
and the control case is in signal connection with the linear array camera, the linear array light source, the position sensor and the encoder.
Preferably, the linear array light source is mounted on the mounting bracket and located above the production line, and is used for polishing the opaque material detection object.
Preferably, the linear array light source is installed on the installation support and located below the production line, the linear array light source is located between the gaps of the two production line conveyor belts and used for polishing the transparent material detection object downwards, and compared with polishing on the upper side, polishing on the lower side enables the image to be clearer and the precision to be higher.
Preferably, the number of the linear array light sources is two, the linear array light sources are installed on the installation support and distributed above and below the production line, the linear array light sources located below the production line are arranged between the gaps of the two production line conveyor belts and used for polishing transparent material detection objects, and the polishing can be increased while the polishing is performed below, so that the detection precision is increased.
Preferably, the mounting bracket comprises two upright posts and two cross rods, the upright posts are vertically arranged and are positioned at two sides of the production line conveyer belt, and two ends of each cross rod are connected to the top ends of the upright posts; the linear array camera is arranged in the middle of the cross rod, and the shooting direction of the linear array camera faces to the lower conveying belt of the production line.
Preferably, the control cabinet comprises a controller, a wireless module and a power supply device; the controller is in signal connection with the position sensor, the encoder, the linear array camera, the linear array light source and the wireless module; the power supply device is used for supplying power to the position sensor, the encoder, the linear array camera and the wireless module.
Preferably, the power supply device comprises a two-way switch power supply and a filter with a safety switch connected with the two-way switch power supply; the input end of the filter with the safety switch is an interface for externally connecting alternating current, and the two-way switch power supply is used for converting the alternating current into direct current of 12V and 24V.
Preferably, the detection method of the controller is as follows:
step 1: acquiring an image of a measured object shot by a linear array camera;
step 2: preprocessing the image: image filtering, image enhancement and contour enhancement;
and 3, step 3: matching and positioning images, and correcting the images;
and 4, step 4: extracting defects and judging after image comparison;
and 5: and outputting the result.
The invention has the following beneficial effects:
the invention is used for large-area high-precision image acquisition and detection, and compared with an area-array camera, the linear array camera has higher pixels when shooting a large-area object, thereby improving the detection precision; furthermore, the linear array light source is added, and can provide various lighting modes, so that the linear array camera is provided with lighting conditions, the object to be detected is clearer, and the detection precision is increased;
secondly, the position sensor provides start-stop position information of the measured object, so that the controller can conveniently control the linear array camera to start and stop; the linear array camera acquires images in a line and a row, a fixed acquisition speed can be set without an encoder, and when a production line stops, the camera still continues to acquire images, so that the images are not in accordance with reality; the encoder signal can control the camera image-picking frequency, so that the line-scan digital camera can conveniently pick images, and the problem of image acquisition under the condition of unstable operation of a production line is effectively solved. The invention has high integration level and is easy to install.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 4 is a schematic diagram of the power supply apparatus of the present invention;
FIG. 5 is a flow chart of a detection method of the controller according to the present invention.
Reference numerals: 1. mounting a bracket; 101. erecting a rod; 102. a cross bar; 2. a line scan camera; 3. a linear array light source; 4. a position sensor; 5. an encoder; 6. a control cabinet; 7. a production line; 8. an object to be measured.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The first embodiment is as follows:
referring to fig. 1, the present invention is a large-format object flexible visual online detection system, which includes: the system comprises an installation support 1, a linear array camera 2, a linear array light source 3, a position sensor 4, an encoder 5 and a control cabinet 6;
the mounting bracket 1 is arranged at the side part of the production line 7 and is used for mounting the linear array light source 3 and the linear array camera 2; installing support 1 includes pole setting 101 and horizontal pole 102, and pole setting 101 is two, and the vertical setting of pole setting 101 just is located the both sides of production line 7 conveyer belt, and the top in pole setting 101 is connected at horizontal pole 102 both ends.
The linear array camera 2 is installed on the mounting bracket 1 and is located the measured object 8 that is used for shooing on the production line 7 above the production line 7, specifically is: the linear array camera 2 is arranged in the middle of the cross bar 102, and the shooting direction of the linear array camera 2 faces to a lower conveying belt of the production line 7; in the embodiment, the linear array camera 2 is high in resolution, and a high-resolution lens is carried, so that the precision of the acquired large-format image is higher than that of the image acquired by the traditional area array camera, and the detection precision is improved; the existing area-array camera has fixed visual field and fixed pixels, and when the image to be acquired is large in size and the ratio of the length to the width exceeds the shooting size of the area-array camera, the image shot by the area-array camera is not complete; the linear array camera 2 is used, the principle is single line scanning shooting, the image length is not influenced, and the image with large length-width ratio difference can be shot; meanwhile, the pixels of the linear array camera 2 can reach 8K, 16K, 32K and the like, and compared with an area array camera, the precision is higher.
The linear array light source 3 is long, the linear array light source 3 is installed on the installation support 1 and transversely extends relative to the conveying direction of the production line 7, and the linear array light source 3 is used for irradiating a measured object 8 on the production line 7; linear array light sources 3 with different types and lengths can be selected according to the width of an object 8 to be measured; in this embodiment, two sides of the linear array light source 3 are mounted on the upright 101 of the mounting bracket 1 and located above the production line 7, and the upper linear array light source 3 irradiates the production line (i.e. the surface of the object to be measured) at an inclined angle to prevent the linear array camera 2 from being shielded; the line light source 3 located above the production line 7 is suitable for surface detection of opaque objects on the production line 7, for example: cardboard pattern printing inspection, ceiling printing inspection, cloth printing inspection, and the like.
The position sensor 4 is arranged on the production line 7 and used for acquiring start and stop position information of a measured object 8; a color sensor, a photoelectric sensor, a proximity sensor, and the like are used according to different detection environments.
The encoder 5 is arranged on the production line 7, the detection end of the encoder is in contact with the production line conveying belt, and the encoder 5 is used for judging the movement distance of the measured object 8 according to the real-time collected production line movement distance;
the control cabinet 6 is in signal connection with the linear array camera 2, the linear array light source 3, the position sensor 4 and the encoder 5. After the position sensor 4 detects the measured object 8, sending a starting position signal to the control cabinet 6, sending a starting signal to the linear array camera 2 by the control cabinet 6 for image acquisition, conveying the measured object 8 through the production line 7 until the position sensor 4 does not detect the measured object 8, sending a terminal position signal of the measured object 8 to the control cabinet 6, and sending a stop signal to the linear array camera 2 by the control cabinet 6 so as to stop image acquisition; the controller outputs the image acquisition frequency signal of the linear array camera 2 according to the movement distance of the measured object 8 detected by the encoder 5 in real time, and the image acquisition of the linear array camera 2 is acquired line by line, the acquired images are spliced line by line, the linear array camera 2 is spliced, the control cabinet 6 can control the image acquisition frequency of the camera according to the signal of the encoder 5, and the image acquisition under the condition that the production line 7 is unstable in operation is effectively solved.
Referring to fig. 4, the control cabinet 6 includes a controller, a wireless module and a power supply device, so as to meet the requirements of different working conditions, reduce external mechanical installation, wiring and the like, and be safer and more convenient; the controller is in signal connection with the position sensor 4, the encoder 5, the linear array camera 2, the linear array light source 3 and the wireless module; the wireless module is used for carrying out wireless communication with the cloud end of establishing in addition, makes things convenient for the staff to look over equipment running state in real time, and in this embodiment, wireless module adopts 4G communication module. The power supply device is used for supplying power to the position sensor 4, the encoder 5, the linear array camera 2 and the wireless module; the power supply device comprises a double-circuit switch power supply and a filter with a safety switch, wherein the filter is connected with the double-circuit switch power supply; the input end of the filter with the safety switch is an interface for externally connecting alternating current, and the two-way switch power supply is used for converting the alternating current into direct current of 12V and 24V.
The working process of the invention is as follows: when the position sensor 4 detects that the object to be measured 8 reaches the designated position, the controller receives a trigger signal of the position sensor 4 and starts the linear array camera 2 according to the trigger signal; the linear array camera 2 shoots a measured object 8 to obtain image data and transmits the image data to the controller; the controller carries out image detection and outputs a detection output signal, and when the detection is qualified, a qualified signal is sent and then the next image acquisition is carried out; when the detection is unqualified, an unqualified signal is sent, an additional alarm indicating lamp gives an alarm, and a worker can control the production line 7 to stop or perform other actions according to the alarm signal. The detection of the controller adopts the existing machine vision identification method, which is not described herein. The detection result can be transmitted to the cloud platform through the wireless module.
Referring to fig. 5, in some other embodiments, the controller performs visual inspection using conventional morphology algorithms and deep learning algorithms to detect object size, flaws, scratches, etc. as desired. The detection method of the controller comprises the following steps:
step 1: acquiring an image of a measured object 8 shot by the line camera 2;
step 2: preprocessing the image: image filtering, image enhancement and contour enhancement;
and step 3: matching and positioning images, and correcting the images;
and 4, step 4: extracting defects and judging after image comparison;
and 5: and outputting the result.
Example two:
referring to fig. 2, the present embodiment is a large-format object flexible visual online detection system, which includes an installation support 1, a line camera 2, a line light source 3, a position sensor 4, an encoder 5, and a control cabinet 6; the linear array camera 2, the linear array light source 3, the position sensor 4, the encoder 5 and the control cabinet 6 of the embodiment have the same structure and signal transmission;
the difference between this embodiment and the first embodiment is: the mounting position and the lighting direction of the linear array light source 3 in this embodiment are different from those in the embodiment, in this embodiment, the linear array light source 3 is mounted at the lower part of the vertical rod 101 of the mounting bracket 1 and is located below the production lines 7, the linear array light source 3 is located between the gaps of the two production lines 7, and the lighting direction of the linear array light source 3 faces the transparent object to be tested 8 between the two production lines 7. The embodiment is bottom polishing, and is suitable for transparent object surface detection, such as thin film printed circuit detection, thin film package printing detection and the like, and compared with top polishing, bottom polishing has the advantages of clearer image and higher precision.
Example three:
referring to fig. 3, the present embodiment is a large-format object flexible visual online detection system, which includes an installation support 1, a line camera 2, a line light source 3, a position sensor 4, an encoder 5, and a control cabinet 6; the linear array camera 2, the linear array light source 3, the position sensor 4, the encoder 5 and the control cabinet 6 of the embodiment have the same structure and signal transmission;
the present embodiment is different from the second embodiment in that: in the embodiment, the linear array light sources 3 of the first embodiment are added to the linear array light sources 3 of the second embodiment, in the embodiment, the number of the linear array light sources 3 is two, and the two linear array light sources are installed on the installation support 1 and distributed above and below the production line 7; the linear array light source 3 located above the production line 7 is mounted on the upper portion of the upright rod 101 and is polished upwards towards the measured object 8, the linear array light source 3 located below the production line 7 is mounted on the lower portion of the upright rod 101 of the mounting bracket 1 and is located below the production line 7, the linear array light source 3 located below the production line 7 is located between the gaps of the conveyor belts of the two production lines 7, and the polishing direction of the linear array light source 3 is towards the transparent measured object 8 between the conveyor belts of the two production lines 7. Both the embodiment and the embodiment are suitable for the object 8 to be measured made of transparent material, and the upper polishing can be added while the lower polishing is performed, so as to increase the detection precision.
The parts not involved in the present invention are the same as or implemented using the prior art.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A large-breadth object flexible visual online detection system is characterized in that: the system comprises an installation support, a linear array camera, a linear array light source, a position sensor, an encoder and a control cabinet;
the mounting bracket is arranged at the side part of the production line and is used for mounting the linear array light source and the linear array camera;
the linear array camera is arranged on the mounting bracket and positioned above the production line and used for shooting a measured object on the production line;
the linear array light source is long-strip-shaped, is arranged on the mounting bracket and transversely extends relative to the conveying direction of the production line, and is used for irradiating a measured object on the production line;
the position sensor is arranged on the production line and used for collecting the start-stop position information of the measured object;
the encoder is arranged on the production line, the detection end of the encoder is in contact with the conveying belt of the production line, and the encoder is used for acquiring the movement distance of the measured object in real time;
and the control cabinet is in signal connection with the linear array camera, the linear array light source, the position sensor and the encoder.
2. The large-format object flexible visual online detection system according to claim 1, characterized in that: the linear array light source is arranged on the mounting support and is positioned above the production line.
3. The large-format object flexible visual online detection system according to claim 1, characterized in that: the linear array light source is arranged on the mounting support and below the production line, and the linear array light source is arranged between the gaps of the two production line conveyor belts.
4. The large-format object flexible visual online detection system according to claim 1, characterized in that: the number of the linear array light sources is two, the linear array light sources are arranged on the mounting support and distributed above and below the production line, and the linear array light sources positioned below the production line are arranged between the gaps of the two production line conveyor belts.
5. The large-format object flexible visual online detection system according to claim 1, characterized in that: the mounting bracket comprises two upright posts and two cross rods, the upright posts are vertically arranged and are positioned at two sides of the production line conveyer belt, and two ends of each cross rod are connected to the top ends of the upright posts; the linear array camera is arranged in the middle of the cross rod, and the shooting direction of the linear array camera faces to the lower conveying belt of the production line.
6. The large-format object flexible visual online detection system according to claim 1, characterized in that: the control cabinet comprises a controller, a wireless module and a power supply device; the controller is in signal connection with the position sensor, the encoder, the linear array camera, the linear array light source and the wireless module; the power supply device is used for supplying power to the position sensor, the encoder, the linear array camera and the wireless module.
7. The large-format object flexible visual online detection system according to claim 6, characterized in that: the power supply device comprises a double-circuit switch power supply and a filter with a safety switch, wherein the filter is connected with the double-circuit switch power supply; the input end of the filter with the safety switch is an interface for externally connecting alternating current, and the two-way switch power supply is used for converting the alternating current into direct current of 12V and 24V.
8. The large-format object flexible visual online detection system according to claim 1, characterized in that: the detection method of the controller comprises the following steps:
step 1: acquiring an image of a measured object shot by a linear array camera;
step 2: preprocessing the image: image filtering, image enhancement and contour enhancement;
and step 3: matching and positioning images, and correcting the images;
and 4, step 4: extracting defects and judging after image comparison;
and 5: and outputting the result.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210085197.8A CN114428080A (en) | 2022-01-25 | 2022-01-25 | Large-breadth object flexible visual online detection system |
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| CN202210085197.8A CN114428080A (en) | 2022-01-25 | 2022-01-25 | Large-breadth object flexible visual online detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047204A (en) * | 2021-09-27 | 2022-02-15 | 广州超音速自动化科技股份有限公司 | Lithium battery diaphragm detector |
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- 2022-01-25 CN CN202210085197.8A patent/CN114428080A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047204A (en) * | 2021-09-27 | 2022-02-15 | 广州超音速自动化科技股份有限公司 | Lithium battery diaphragm detector |
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